Mining-machine.



' F. L. SESSIONS.

MINING MACHINE.

APPLICATION FILED JAN.7. mos RENEWED JUNE 4, 1909.

Patented Dec 22, 1914.

a SHEETS-SHEET 1 huh F. L. SESSIONS.

. MINING MAGHINE. APPLICATION FILED JAN.7,'1903, RENEWED JUNE 4, 1909.

1 1 22,3, Patented Dec. 22, 1914.

3 SHEETSSHEET 2.

P. L. SESSIONS. MINING MACHINE.

APPLICATION FILED .TAN.7. 1903. RENEWED JUNE 4, 1909.

. Patented Dec. 22, 1914.

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FRANK L. SESSIONS, 0F COLUMBUS, OHIO, 'ASSIGNOR, IB Y KSSIGNMENTS, TOTHE JEFFREY MANUFACTURING COMPANY, A CORPORATION 075 OHIO.

MINING-MACHINE.

Specification of LettersPatent. 1 31 1 1 91 D 22 1914 Application filedJanuary 7, 1903, Serial No. 138,158. Renewed June'a, 1909.Seria1N0.'500,123.

and useful Improvements in Mining-Ma chines, of which the following is aspecification, reference being had therein to the accompanying drawing.

The invention relates to side cutting mining machines and particularlyto the type of machine which has an elongated cutter frame projectingfrom a suitable main frame and carrying suitable cutting mech anism,usually in the form of a cutter chain which moves in ways on the cutterframe.

One of the more important objects at tained by the invention is themaintenance of the cutter bar at a suitable angle to the face Jf-thecoal as the cutting proceeds. 1n

m chines of this character the best results are secured when thelongitudinal axis of the cutter bar is maintained at about 90 to thecoal face.

essarily applied to the machine at points outside the body of the coalanda-s the major part of the resistance is offered by the coal againstthe cutters, the tendency is for the 0 outer frame part to advancefaster than the cutter, frame so that the latter swings backward and themachine is not held up to its work. By my invention the cutter frame ismaintained at a proper angle to work cf- -5 fectively, eitherautomatically or under the $5 The foregoing and various otherobjects ofthe invention willbe understood from'the following description whichsets forth, in

connection with the accompanying drawings, the features ofconstruction,- arrangements and combinations of parts in which theinvention consists.

Figure 1 1s a plan View of a mining ma. ch1ne embodying my improvements.Fig. 1'

is a fragmentary view' of a part of acutterframe showing cutter bitsthat are reversible As the force which advances- 25 the machine alongthe face of the coal is necthough not'automatically. Fig. 2 is a viewpartly 1n side elevation and partly in section, of the same. Fig. 3 isaside elevation. Figs. 4, 5 and 6 are diagrammatic plan viewsillustrating the mode of operating the machine. Figs. 7 to 21 showdetails. Fig. 22 is an elevation of the forward end of the machine, theside shown being opposite to that illustrated in Fig. 2.

The mechanism comprises what may be regarded as a bed, a cuttingapparatus, an engine or motor, means for causing .the movements of themachine bodily from ,place to place, power transmittingdevicesinterposed between the engine or motor and the cutting apparatus,power transmitting devices interposed between the engine or'mo tor andthe transporting "devices, and. a framework upon which all of theoperative parts are supported, and which. in turn is supported upon thebed part.

A indicates the bed part as a whole; B the cutting apparatus; C themotor or;,engine; l) the devices by which the machine is trans ported ormoved from place to place; E the power transmitting devices foractuating the cutting device; F the devices which transmit powerand-motion to the machinemoving parts; and G the framework which carriesall of the operative arts.

The bed: or ground support consists of runners or shoe-like bars at a a,one upon each side, with suitable cross bars as at a for firmly holdingtogether the side parts. The bars a, a constitute a plate-like supportthat adapts the machine for free movement in all directions over themine. 1

The cutting apparatus as illustrated con sists, of a chain H mounted inguideways upon a frame indicated asa whole by 1.. In

Figs. 1, 18 and. 19, ad also iD. \FigS;.9/Q and the ground orfloorofinatically reversible cutter bit wean in Figs l and 3, the chain shownhas as mpler form of bit-which can be manually re versed. when desired.In the caseof the automatically reversing cutters, the bitsarc :held inpivoted blocks which are adapted to swingso as to present oneor theother of thebitsin operative position according to' the direction oftravel of the chain. 1 he Hit) frame consists of the pivoted plate 2'andphq part-z", the latterhaving grooves at in which is fitted theoutwardly extending part i of 'the pivoted plate. The pivotal portion.at i is in a plane somewhat above that'of the buter portion i, so thatthe chain shall. have clearance in traveling. At the outer endof thechain, frame there isa sprocket wheel J.

xThe'two' parts of the chainplate are ad-' ju'stable, there being anadjusting screw at K -which passes through a nut 70 in a recess .in thepart of the platez', and bearing and armature shaft 0, provided'with apinion C. The motor metal isso arranged as 'to incase-the commutator andthe adjacent arts. 7 The'framework G which is interposed between'the bedand the operative parts and upon which the latter are directly mountedcomprises-two arallel bearing plates L, L,

arranged one a ove the other and extending ifjrearwardfromthe mainframeor the motor -metal,- and'each havinga vertically disposedsupporting plate for the cutting apparatus above described.

flange, which is secured to the said main frame or motor metal by meansof bolts. A

at L isextended forward from therear part of the'frame and is formedwith an elongated tubularbearing Z arranged vertically. M is a verticalshaft mounted in "this hearing, preferably in a sleeve m fitted into thebearing part Z. It carries a sprocket wheel Nat its lower end with whichthe cutter chain. Nearthe upper end-it has a beveled wheel Nengaging-with the aforesaid beveled pinion C on the end ofthe motorshaft. The wheel N being keyed rigidly to the shaft M it notonly causesthe rotation of the shaft, but also the motion of the chain through itsguideways in the frame. The inner pivoting'plate i of the chain frameis'mounted on and turns around the.

sleeve 1 as abearing. The shaft'M is additionally supported at the upperend by means. a vit hearing plate L extending out from the frame or fromthe motor metal, as

-The'means for transporting the machine from place to place consists ofarope' or cable P ha'v' g one-end secured to a winding drum P (1extending jthence" around a sheave P -jwhich is securedto some suitablestationary Objechand having its other end fastened'to a disk or plate P.The latter is of. the nature of a peripherally grooved sheave ofrelatively large diameter. It is connected to the cutter chain frame ina suitable way so that as its turns in either direction said frame willbe cqmpelled toturn with it. As shown, it is also connected {to abracing ringor collatP having a downwardly extending arm or flan e andthis arm and the sheave or wheel plate z' of the chain frame are securedtogetherb'y bolts at p. Although I have shown them bolted and separated,sheave P and; plate imay be all one casting. The

winding drum P7 is rotated by means of a gear wheel 9 with which engagesa driving pinion g. on'a shaft 9?. The latter atone 7 end has a ratchetwheel Q with which ena and the gages apawl Q carried by a radius arm Qcentered upon the shaft. The'radius arm and pawl are reciprocated by alink Q whichi's connected to a reciproc'atedframe Q held ina guide Q".Theframe is pi'votally connected to the arm Q of.

. airing o= which; fits an eccentric R "at the upper end.

of the shaft M. At each rotation of the shaft stheeccentric gives onereciprocation to the part'QP and that in turn gives one.

feeding movement to'the pawl and ratchet wheel. a

S is aplate or bar the end of which lies near the pointsof'the teeth onthe ratchet ment of the awl Q. This plate can be adjusted so t at itsend shall expose one, two or more of the teeth of the ratchet wheel, andinthis way the extent of feed of themachine will be controlled. If theplate S is so held that its end entirelyprevents wheel Q and also liesin the path of-movethe pawl from engaging with the ratchet wheel, theadvancin movement of the machine will bestoppe The pulley orsheave 1,around whichthe rope passes, may be fastened to "any suitable holder,such as a stake in the ground or floor of the mine, or

it can be secured to an anchor in a wall of coal or rock, or to anupright or post secured in the roper place.

thrust bars T, T, arranged to be ward by projecting lug P on disk P andpivoted at their ends to levers T, T. Le-

vers T, T are rigidly mount d' upon shaft 'T which has bearings at T, T,upon the frame G. Lever" T point where bar T is pivoted to it and tothis elongation is attached oneend of spring T and bar T. The-other endof spring T At either side of the machineare provided I pushed foriscarried above the \isiattached to .the motor frame. The other end of barT is adjustably connected to bar S b means of a hand screw 2%. Spring Tten s to draw barT" together with bar S rearward so as to prevent thepawl Q from engaging with theratchet teeth. The ends of thrust bars T,Tlie in or nearly-in the plane of rotation of the rope sheave or disk Pand the latter is provided with a lug P which is adapted to strikeagainst the end of the thrust bar and push it forward when the diskorsheave P rotates far enough to 'bring.them together, and att' there is ahook on the bar =T adapted to ride over,

iaaaoea drop behind and engage with a lug p on the sheave. The lugs Pand p are so situated that they come into action at about the time thatthe cutter frame has reached the lines at right angles tothe lines ofadvanceof the machine as a whole. At about this time the hooked end. ofthe bar T drops into engagement with. the lug p and the lug P lies Iadjacent to the end of the bar T. Therejunction with the resistanceofthe coal to the travel of the cutters around the cutter (3 after, itthe chain frame should swing rear-- ward to an angle less than 90degrees, it will tend to draw the bar T backward and to draw the bar orplate S over the ratchet and cut off some/of the teeth from theaction-of the p 'wl Q and the feed of the machine will be reduced. Thevspeed of the cutters will remain the same however and they will form akerf relatively faster by reason of the reduced rate of feed.Consequently the cutter frame will swing forward in accord v ance withits constant tendency under the action of the chain-drlve gearing inconframe. As the cutter frame thus swings forward the rate of feedeffected by the pawl and ratchet devices is increased again and when thecorrespondingly increased resistance of the coal to the advance of thecutter frame balances the forces tending to swing the cutter frame.forward, such swinging.

stops and equilibrium is thus againrestored. Too great travel of bar Tis prevented by so sl api n its engaging end that it will automa-tical ydisengage when sheave P has rotated backward a predetermined amount.This disengagement is effected by the suppgrting stirrup T against whichthe raised portion T strikes when bar T is forced rear-1 ward. Bar '1"is held in engagement with lug bythe spring p Vi ile, in the normaloperation. of the machine, the automatic operation above referred to islargely relied on, the machine operator can at all timesv have anoptional control of the bodily advance of the machine and of the angularposition of the cutter frame, by suitably adjusting the guard plate S inthe bar T such adjustment being effected by means of the hand screw 6 Toprevent the winding mechanism P from paying out cable .when the cutterframe is dropping back from "the carriage frame under excess of load,and also to lock the ratchet Q" zigztinstback rotation during theinterval when the pawl Q is disengaged from said ratchet so as to insureforward feed of the machine, I provide a stationary pawl WV pivoted at wto a lug W on the frame G. A spring w secured to the frame (a engagesthe under surface of the pearl" holding it normally-against the ratchetQ The thumb piece 10 provides means for lift ing the pawl oil theratchet to quicklystop the feed of the a age n-ame, *WhcnFthe pawl isdrawn back the spring holds it against. engagement with the. ratchet asshown in dotted lines in Fig. 10.

It it frequently necessary to adjust the inclination of the cuttingapparatus to the.

horizontal, it being sometimesrequisite that the chain frame should movein a horizontal plane and at other times that it should be inclined inrelation to the horizontal, or in relation'to the ground line. Toaccomplish such adjustment, I provide the bed frame and the frame whichsupports the operative parts with devices for adjusting the latter by atilting movement on the former. The two frames are hinged together at U,this being at a line near the rear end. At the front end there is athreaded lifting device consisting of a screw V which, at-the lower end,is trunnioned or hinged at c to the bed frame. A double flanged nut Vengages with the motor frame G by means of a flange on the latter, andthe adjustable nut V permits the ends of the two frames to be separated.or to be brought closer together, according as a greater or lessinclination of the cutting apparatus to the ground line is desired.

The mode of operating a machine of the kind. above described will: bereadily under stood.

The mechanism is adapted for cutting coal either upon the room andpillar plan or upon'the wall plan. Theseveral impor- K tant positions inthe operation of undercut ting a room in the room and illar plan ofcutting are illustrated in the diagrammatic views in Figs. 4:, 5 and 6.In starting the operation in a room, the machine is placed as shown inFig.4, that is to say, close to one pillar wall with the cuttingapparatus projecting away from this wall and with the framework paralleland close thereto. An anchor and pulley are temporarily fastened asshown in Fig. 4:, and the machine is jacked down by screw braces whichhold it firmly in position. Thenthe operative parts being put intoaction, the cutter chain is set in motion and simultaneously therope-winding devices draw upon the rope and, pulling the latter aroundthe anchorsheave, cause the resistance to the movementof the cuttersaround the cutter frame. The nature of this latter force will readilybeunderstood theresistance to the movement of the cutters is supposed tobe great enough to pre :lcutter frame in relation to the face of the thedrive gear on the cutter frame. the'cutters have penetrated the coalsuffi- "cutting! is stopped and the machine is turned vent suchmovement; then the cutter chain is in' effect locked to'the. cutterframe and the driving. effort of thepinion C tends to swing the framelike a lever. Obviously any lesser resistance to the travel of thecutters will be accompanied by a similar though correspondinglyweakerleverage action by After fciently to reach the rib or pillar line the eposition shown in 'Fig. 5. The

.' "anchor and its sheave'are now'placed near the opposite ribor pillarwall. The cutters are reversed in the cutter chain, either auto-'matically or by hand, according to the form of. cutter used, and therope is secured to 'the' opposite "side of thesheave ordisk P 'Power isagain applied to the machine, and the cutting action is continued acrossthe face of the room. During this action noveland peculiar resultsareobtained with re- Spect to the action of the feeding apparatus, theadvance of the machine as a whole, and the control of the angularposition of the coal. As themachine advances along the face of the' coalit is,-as an entirety, subject I --to thefollowing main or controllingforces,

"the rope P acting on the main frame of the.

namely, the tension ofthe outside-run of machine; the tension of-theinside run of the ropejl the direct action of which is on on "the cutterbits.

th'c'utter frame of the-ma the rear" Ward reaction of'the coal at Xagainst the coal on the cutter bits which tends to draw the cutter frameinward and therefore to hold the-machine up to its work, the forwarddraft-of the inside run of the rope P which tends to swing the inner endof the cutter frame forward, the forward pull of the main frame on thecutter frame through the shaft M, and the force of the driving pinion Owhich tends, by reason of the resistance to thetravel of the cutters, toswing the main or inner part of the cutterframe forward. The inwardreaction on the cutters acts always advantageously by tending to holdthe machine up to the coal face and it need not be further considered.The remaining v forces acting on the cutter frame structure cutters;'andth'einward reaction of the coal Now it will be understood that theadvance of the cutter frame structure along the face of the coal so asto 40 undercut the seam, and the maintenance of the cutter framestructure'in a suitable angular relation to the face of the coal for aproper performance of its functions, is the ultimate object sought, andit therefore important to note the main or controlling c forces to whichthe'cutter frame, including parts which under conditions of operationcan be considered as more or less rigid-with the cutter frame proper, issubjected; in

some" machines the cutter frame proper is pivotally connected withamainframe part,

as 1n the present case,w hile inother machines the cutter frame properand the main ,frame part ar' rigidly united, butin either case the moments of the cutter frame fp'r'oper are de ermined by the main orcontrolling force to which the rigid structure,

including 'th cutter frame proper, is sub- 6b jected. In my improvedmachine the main forces acting upon the vcutter frame structure.(including the cutters, the sprocket wheel N, the shaft M and the gearN) are the rearward reaction of the coal on the cutters which tends toswing the cutter frame reanwand the inward reactionof the backward, b

determine its advance along the face of the "coal and its relativeangular position with movement 0 the lug P which lies] adjacent trherear end of the thrust barv T, the spring is ward so as to prevent the"paw Q? from elkgaging with one or more or even all of the teeth of theratchet wheel Q, which the pawl would otherwise enga e in its normalstroke. Of course, ifjthe hoo t on the end of the bar T had been engagedwith the adjacent lug p the'rearward movement of thebar T is assured bysuch positive engagement as well as by the action of the spring T.Thismovement of the guard plate Smore or less backward results in acorresponding re-' tardation of the forward feed of the machineThisretardation of, the 'machines advance permits the cutters-which are"in continuous action, to "form thekerf more rapidly in, relation tothe-advance' of the machine so that the cutter ba'r is'jagain aduallyswung forward toward its norma an free to drawjthefguard late Sbackreason of the corresponding gular position inrelation toi-the faceof the coal, the cutters beingheld up totheir work during such swingingof the cutterframe by the combined action' of the tension of the innerrun ofthe rope 'P and the leverage action of the drive inionreviously'explained, or by this ast name leverage action alone, in casethe automatic adjustment of the plate S had been suchas to stop theforward feed of the machine as an entirety. As the cutter frameapproaches in its forward swin the normal angular position, the lug P on(is rope sheave or disk P engages thereupon the forward feeding the endif the thrust bar T and the latter is caused-to push the bar S forwardsomewhat so that thepawl can again reach one ormore of the teethon theratchet wheel and of the machine at its more normal rate is resumed.

The control of the advance and angular position of thel'cutter frameabove described is, of course, wholly automatic; but it w1ll heunclerstood'tha t the machine operator can at any time have an optionalcontrol of the position of the guard plate S by means of the hand screw.t and can, therefore, control at will the advance of the machine as anen tirety and the angular position of the cutter frame in relation tothe coal face. This optional manual control of the machine 1s availablewhile the machine is advancing and working, as in the case of theautomatic control, and is especially advantageous when obstructions ofan unusual nature are encountered by the cutters as it enables themachincoperator to handle the machine in the most advantageous manner ineach case.

. i I It may be remarked that the iiOtlOIl' of the feed rope u on themachine is diflere'ntial in itsnature' 1y reason of the fact that theoutside run of the rope exertsits draft directly on the main frame artswhile the inside run of the rope eXer its draft on the cutter framewhich is pivotally connected to the mainframe, thus, when the rearwardpreponderating effect, in conjunction with the rearward reaction of thecoal, is to swing, the cutter 'frame rearward, although the draft of theinside run of the feed rope on the cutter frame acts in conjunction withthe drive pinion C with a tendency to swing the cutter frame forward.The adjustment of the guard'plate S, either automatically or manually,as described above, effects, it Will be seen, a relative variation ofthe forces tending to swing the cutter frame rearward and forward,respectively; and it is by such relative variation of these forces thatthe angular position of the cutter frame in relation to the coal face iscontrolled as the machine advances in its work.

lVhen, in the process of undercutting the scam, the machine hasapproached as near as possible to the left pillar wall of the room, itis stopped and moved'into the position shown by full lines in Fig. 6.The main frame having then been jacked down, the motor is started andthe cutter frame 55 swung around tothe left, as indicated by dottedlines, to complete the cut. This swinging of the cutter frame iseffected, as will readily be understood by the combined action of thedraft of the rope P and by the leverage action of the chain drivinggears upon the cutter frame.

It will now be readily understood that the control of the advance andangular position of the cutter frame as the machine moves along the faceof the coal, themanner of making the entering or sumping cut at one arib or pillar wall and of completing the undercut at the other pillarwall and various other possible manipulations of the machine,

are all intimately connected up with and more or less dependent upon thecapacity of the main frame for universal movement over the mine floor.It will be seen further that the connection of the draft rope to themachine at a point or points close to the coal face helps to hold themachine up to its work. This construction and arrangement of the draftrope devices, the capacity xofthe cutter frame to yield or swingrearward, and then regain its normal position,

and the inward reaction of the coal 0n the cutter bits tending to holdthe rear end of the machine up to the face, are features which in theircombind action make possible the operation of t e machine without theuse of tracks or d gler rigid guide devices. 1 Iain aware that swingingcutter frames held by vertical pivot s to the ,main frame haveheretofore been used or proposed but in all such cases within myknowledge the machines diifered from presentinvention in that provisionof one sort or another was made for having the swinging cutter framelocked in its operative position in relation to the main frame, I amalso aware that it has been proposed to arrange draft devices,

such as cables or chains, so that they should extend forward from awinding mechanism on the main ,frame around the stationarysheave oranchor and thence back to the laterally extending cutter frame; but thiswas done in machines of the character tl30"6 referred to in which thechain frame was rigidlylocked inoperative position'to the main frame,and therefore the basic and also aware that it has been proposed .in thecase of a machine with a main frame and a rigidly connected cuttingapparatus, to interpose between the feeding and controlling" mechanismand the machine proper; a friction connection of such a nature as topermit slippage, as, for instance, in the patent to lie lac

' to 1tchell,.No.

it is preferred to give the cutter frame a Kan ley, No. 435326, and alsoin the patent M 656,414; but injmy machine capacity for yielding orswinging rearward and subsequently regaining its normal angu- '13!position as the conditions change, as well a as to provide for avariable feed of themachine as an entirety;

Ofcourse it will be understood that in many respects there can bemodification as concerns the details of the parts shown withoutdeparting from the essential features of the invention.

What Iclaimis: 1. In a 'ningmachine, the combination -.of" a main frame,a cutter-carrying frame carried by the main frame but free to movethereon during the cutting operation cutters thereon traveling in linestransverse to tlie'travel of the main frame, and a feeding mechanismhaving two independent points [of connection'with the machine, one onthemain frame, and oneon the cutterframe,

means for actuating the cutters and the feedingmechanism simultaneously,and means for automatically throwing out of action I the feedingmechanism, substantially as set forth. l 1 a 2; In a mining machine, thecombination said frame bodily on the ground, a cuttercarrying framepivoted on the main frame and free to move about its pivot during thecutting operation, and means, supplemental to said main frame moving"devices, for moving the cutter frame relative to the main frame. 5

3'. In a mining machine, the combination of the main namacutter-carrying frame thereon-andf movable relatively thereto durv ingthe cutt ng operation, a feeding mcchanism for advancing thecutter-carrying 'frame, a supplemental feeding mechanism and meansactuated by the cutter-carrying [4; 'In a mining machine the combinationV frame for throwing the supplemental feeding mechanism out of action,substantially asset ,forth.

of a mainframe, a cutter carrying frame pivoted thereon and adapted toassume different angles of inclination to the' line of movement of themain frame, it being free mechanismfor cjper'atingv the cutters, and,

main frame to swing about a vertic to change "its positions duringcutting operations under the different conditions of resistancevofferedto thecutters, a feeding i nism.

of the main frame, means for moving the with its inclination to ofa mainframe, a cutter a fixed support and to have one end com; nected to saidcutter frame and its other end 1 connected to said main frame, a windingmechanism on said main frame'for winding up said flexible draft device,owr trans; mitting mechanism interposed etween said motor and saidcutter frame, power transmitting mechanism interposed between said motorand said winding mechanism and means controlled by the position 0 saidcutterframe relative to the main frame for connecting and disconnectingsaid last described train of power transmitting mecha- 6. In a miningmachine, the combination of a mainframe arranged to travel alon theground, a cutter frame connectedto said mainframe to s-win about avertical axis, a motor on the main fi'ame, a winding mechanism thereon,a train of power transmittin devices interposed between said motor andsaid winding mechanism, a train of power transmitting devices interposedbetween said motor and said cutter frame, an endless draft devicearranged to extend around a fixed support or jack and to have one endconnected to said winding mechanism and its other end connectedto saidcutter frame, 1

and mechanism for throwing said winding mechanism into and out ofoperation contro lable by said cutter frame in accordance the mainframe.

I. In a mining machine, the combination of a bed frame'arranged totravel along the ground, a motor mounted thereon, a cutter frameconnected to said main frame to swing about'a vertical axis, a-cuttercarrying chainon the cutter frame, power transmitting mechanisminterposed between said motor and said cutter carrying chain, a windingdrum, variable feed mechanism in-- tel-posed between said winding drumand said motor, a flexible draft device arranged to extend around afixedsnpport or jack and .to have one end connected to said winding drumand its other end connected to sai cutter frame, and means automaticallyactuated by said cutter ing said feeding mechanism into or out ofoperation.

8. In a mining machine, the combinatlon tively mounted on the cutterframe, a motor for driving the cutters, feeding mechani's'jn foradvancing the main ing the cutter frame relative to the main frame, ofthe cutter frame relative to the main frame for varying the rate ofspeed ofthe mainframe, substantially as set forth.

9. In amining machine, the combination a cutter frame movablegiy of amainframe, mounted on the main frame, cutlrs "operav frame and forin'ov-fframe in accordance with its inclination to the main frame forthrowframe movably mounted on the main frame, cutters operaand meansoperable by the movement tively mounted on the cutter frame, a moi torfor driving the cutters, feeding mocha-'- nism for advancing the mainframe and for moving the cutter frame relative to the mam frame, saidmechanism comprising a power driven differential propelhng mealisoperatively engaging the main and cutter.

frames and a stationary abutment, ..and means operable by the movementofthe cutter frame relative to the main frame for/ varying the rate offeed of the. main frame, 7 substantially as set forth.

10. In a mining machine, the combinationl of a main frame, a cutterframe; mounted thereon to swing about a vertical axis, cuttersoperatively mounted ,on the cutter frame, a motor for driving thecutters, feeding mechanism for advancing the main frame and'for movingthe cutter frame relative to the main frame, and means operable by themovement of the cutter frame relativeto the main frame for varying". therate of feed of the main frame-substantially as set forth. a

11. .In a mining machine,.the combination of 'a main frame, a cutterframe mounted thereon to swing about a vertical axis, cuttersoperatively mounted on the cutter frame, a motor for driving, thecutters, feeding mechanism for advancing the main frame and for movingthe cutter frame relative to the-main frame, said mechanism comprising apower driven differential propelhng means operatively engaging the mainand cutter frames and 'a stationary"abut-' ment, and means operable bythe movement of the cutter frame relative to the main frame for varyingthe rate of feedof .the main frame, substantially as set forth.

l2. Ina mining machine, the combination of a main frame, the cutterframe connected to said main frame to swing about avertical axis,cutters carried by said last named frame, a motor mounted on said mainframe, a flexible draft device arranged-to pass around a fixed supportand to have one end connected to said cutter frame and itsv other endconnected to said main frame, a winding mechanism on said main frame forwinding up said flexible draft device, power transmitting mechanisminterposed between said motor and said cutters, power transmittingmechanism interposed between said motor and said winding .mechrnism,and, means controlled by the movement of the cutter frame relative tothe main frame for varying the speed of the winding mechanism.substantially as set forth.

13. In a mining machine, the combination of a main frame adapted inoperation to rest upon and slide in all directions over the mine floor,a cutter frame extending therefrom, means for advancing the main frameand cutter frame which tends in con- 55 junction with the rearwardreaction of the s'tantially as set forth.

cda l to swing the cutter fra" e in one di rection relative to the coalace, means for applying to themachine force, oth than the reaction ofti. coal oti't'he cutters, which junction with the reanward reaction ofthe coal to'swing the cutter; frame n one d1rec- 2 frame and cutterframe which tends in con-"j tion relative to the coal face, meanstending direction, devices for automatically rela- .,tively varying theactions of the said means,

and manual means for relatively varying the actions of the saidmeans,whereby the angular relation of the cutter frame to the coal face can becontrolled automatically manually as the machineadvances, substantiallyas set forth.

. 15. In a mining machine, the combination of a mainframe, acutter frameextending therefrom, means for-advancing the main frame and cutter framewhich tends in conjunction with the rearward reaction of the coal toswing the cutter frame in one direction relative to the coal face, meansoperatmg independently of the advance of the I main frame tending toswing the cutter frame in the opposite direction, and devices forautomatically relatively varying the ac-' tions of the said means,whereby the cutter frame is maintained at asuitable angle to the coalface as the machine advances, sub- 16. In 'a' mining achine, thecombination of a main frame, a cutter frame extending therefrom, meansfor advancing the main frame and the cutter frame which tendsinconjunction with the reaction of the coal to swlng the cutter frame inone direction relative to the coal "face, means opf to swing the cutterframe in the opposite crating independently of the advance of themainframe for applying to the machine a force, other than the reactionof the coal on the cutters, which is adapted to swing the cutterframe-in the opposite direction,

and devices on themachine for relatively varying the actions of theaforesaid means,

whereby the cutter frame can be maintained at a suitable angle to thecoal faceas the machine advances.

17. In a mining machine, the combination of an outer main frame partadapted to move along the face of the coal, an inner rate of advance oftheinner 18. In a mining machine, the combination.

of an outer mam frame -part adapted to move along the face "of the coal,an inner elongated cutter frame 'part carried by the main frame. andadapted to extend within the body of the coal, feeding mechanism foradvancing the machine along the face of the coal, and automatic meansfor varying the end of the cutter frame in relation to the rate ofadvance of theoute'r' end thereof, whereby the angular position of thecutter frame in relation to the coal face is controlled as the machine.advances,

19. In a mining'machine adapted to room and pillar work, the,combination of an elongated main frame,an elongated swingingcutter'frame extending from one end of said main frame, a chain mounted.on said cutter frame so as to be driven in either direction, cutters onthe chain adapted to reverse automatically when the travel of the'chainis r versed, a motor on the main frame for driving the cutters, andmechanism driven by the motor for swinging the cutter frame in onedirection under the coal to a. position closely. adjacent andsubstantially par 'llel to one of the ribs, the main frame arid cutter.frame being pivotally connected; whereby the former may be swung to ah'sition parallel to'the face? of the coal to make the cross-cut in adirection opposite to thatin which the cutter frame was first swung, andthe mech- I anism forswinging the cutter frame being 'operable by themotor to swingsaid frame in either direction relative to the maln frame,

' and pillar work, the com whereby in finishing the undercut adjacent arib, the cutter frame can be swung in a direction opposite that in whichit was swung in starting the cut, so as to carry the cut out to the lineof the ribii 20. In a mining machine apted to room nation of anelongated main frame, an elongated swinging cutter frame extending frsaid mainframe, a chain mounted on said cutter frame so as to be drivenin either di- .main frame and m. cQn unctIon Wltll. the rearwardreaction.

maintained at a ghe direction of In one .end of rection, cutters on bythe former may parallel to the face crosscut in a direction opposite tothat in be swung to a position of the coal to make the swinging thecutter frame 7 ter frame being pivotally connected where- 1 "if i whichthe cutter frame was first swung, and

the mechanism for swinging the cutter I it.

frame being operable by the motor to swing said frame in eitherdirection relative to.

the main frame, whereby in finishin the undercut adjacent a rib, thecutter rame can be swung in a direction opposite that in I which it wasswung in starting the cut, so as to carry the cut out to the line of therib.

21. In a m ning machine, the combinationof a mam frame constructed torest upon and slidefreelyin all directions over the floor of the mine, acutter frame extending therefrom, means for advancing the cutter framewhich tends of the coal to swing the cutter frame in onedirectionrelative to the coal face, means tending to swing the cutterframe in the opposite direction, and devices for automaticallyrelatively said means, whereby the cutter frame is suitable angle to thecoal face as the machine advances, as set forth. 22. Ina mining machine,the combination varying thev actions of the;

substantially,

of a main frame constructed to rest upon I ,V i

and slide freely in'ali directions over the floor of the mine, a.cul terframe extending from the main frame, means for advancing the main frameand the cutter frame which tends in conjunction ,with the rearwardreaction of the coal to swing the cutterframe in one direction relativeto the coal. face, meansfor applying to the machine a force, other thanthe reactionof the coal on the cutters, which is adapted to swing-thecutvices on the machine for relativelylvarying the actions of theaforesaid means, whereby the cutter frame can {be maintained at asuitable angle to the coal face as the machine advances.

In testimony whereof I afiix .my s1gn a ture in. presence of twowitnesses.

Witnesses H. E. BUELL, L. C. PARRo'rr.

FRANK L. SESSIONS.

' ter frame in the opposite direction, and de-

